Improved rates of postoperative ischemia, completeness of aneurysm occlusion and neurological deficits in elective clipping of anterior circulation aneurysms over the past 20 years - association with technical improvements.

While the changes in the rates of postoperative new/aggravated neurological deficits and postoperative ischemia between cohort I and III showed a clear trend but did not reach statistical significance (probably due to the limited and imbalanced sample size), the improved rate of radiologically confirmed complete aneurysm occlusion between cohort I and III did reach significance, – With regard to incomplete aneurysm occlusion we could show a rate of 9.0% in our latest treatment cohort, which is also very similar to the rates of 5.9% up to 15.8% in literature [ 22 , 32 ].

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